Maintenance for the week of December 16:
• PC/Mac: No maintenance – December 16
• NA megaservers for patch maintenance – December 17, 4:00AM EST (9:00 UTC) - 12:00PM EST (17:00 UTC)
• EU megaservers for patch maintenance – December 17, 9:00 UTC (4:00AM EST) - 17:00 UTC (12:00PM EST)
I've not tried to use Game Filter at all in any game, so I can't attest to how it would work and if it'll help make ESO look any better. I can however suggest, if you have not done so already, taking a look at ReShade. I assume it'll do the same thing as Game Filter, just you can download presets for it which there is a whole library on NexusMods, so surely there would be something to take your fancy if you're looking to spice up the colours, been using it meself for years now.
If you're dead set on Game Filter though, I am sorry I can't help much with that, and I wish you luck finding a set up that works!